Here are some of the jubilant photos and Twitter posts from around the nation:

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The celebration at the State Library of Victoria in Melbourne.

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More of the celebrants at the state library.

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A 'flash mob' performs at a street party in Melbourne.

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A couple hugs at the gathering at the state library.

Scott Barbour via Getty Images
The leader of Australia's Labor Party, Bill Shorten, joins the cheering at the state library as the results of the nationwide poll on legalizing same-sex marriage are announced.